/* eslint-disable */
// let api = null;

// alignment pattern\

  var adelta = [
    0, 11, 15, 19, 23, 27, 31,
    16, 18, 20, 22, 24, 26, 28, 20, 22, 24, 24, 26, 28, 28, 22, 24, 24,
    26, 26, 28, 28, 24, 24, 26, 26, 26, 28, 28, 24, 26, 26, 26, 28, 28
  ];

// version block
var vpat = [
  0xc94, 0x5bc, 0xa99, 0x4d3, 0xbf6, 0x762, 0x847, 0x60d,
  0x928, 0xb78, 0x45d, 0xa17, 0x532, 0x9a6, 0x683, 0x8c9,
  0x7ec, 0xec4, 0x1e1, 0xfab, 0x08e, 0xc1a, 0x33f, 0xd75,
  0x250, 0x9d5, 0x6f0, 0x8ba, 0x79f, 0xb0b, 0x42e, 0xa64,
  0x541, 0xc69
];

// final format bits with mask: level << 3 | mask
var fmtword = [
  0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976,    //L
  0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0,    //M
  0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed,    //Q
  0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b    //H
];

// 4 per version: number of blocks 1,2; data width; ecc width
var eccblocks = [
  1, 0, 19, 7, 1, 0, 16, 10, 1, 0, 13, 13, 1, 0, 9, 17,
  1, 0, 34, 10, 1, 0, 28, 16, 1, 0, 22, 22, 1, 0, 16, 28,
  1, 0, 55, 15, 1, 0, 44, 26, 2, 0, 17, 18, 2, 0, 13, 22,
  1, 0, 80, 20, 2, 0, 32, 18, 2, 0, 24, 26, 4, 0, 9, 16,
  1, 0, 108, 26, 2, 0, 43, 24, 2, 2, 15, 18, 2, 2, 11, 22,
  2, 0, 68, 18, 4, 0, 27, 16, 4, 0, 19, 24, 4, 0, 15, 28,
  2, 0, 78, 20, 4, 0, 31, 18, 2, 4, 14, 18, 4, 1, 13, 26,
  2, 0, 97, 24, 2, 2, 38, 22, 4, 2, 18, 22, 4, 2, 14, 26,
  2, 0, 116, 30, 3, 2, 36, 22, 4, 4, 16, 20, 4, 4, 12, 24,
  2, 2, 68, 18, 4, 1, 43, 26, 6, 2, 19, 24, 6, 2, 15, 28,
  4, 0, 81, 20, 1, 4, 50, 30, 4, 4, 22, 28, 3, 8, 12, 24,
  2, 2, 92, 24, 6, 2, 36, 22, 4, 6, 20, 26, 7, 4, 14, 28,
  4, 0, 107, 26, 8, 1, 37, 22, 8, 4, 20, 24, 12, 4, 11, 22,
  3, 1, 115, 30, 4, 5, 40, 24, 11, 5, 16, 20, 11, 5, 12, 24,
  5, 1, 87, 22, 5, 5, 41, 24, 5, 7, 24, 30, 11, 7, 12, 24,
  5, 1, 98, 24, 7, 3, 45, 28, 15, 2, 19, 24, 3, 13, 15, 30,
  1, 5, 107, 28, 10, 1, 46, 28, 1, 15, 22, 28, 2, 17, 14, 28,
  5, 1, 120, 30, 9, 4, 43, 26, 17, 1, 22, 28, 2, 19, 14, 28,
  3, 4, 113, 28, 3, 11, 44, 26, 17, 4, 21, 26, 9, 16, 13, 26,
  3, 5, 107, 28, 3, 13, 41, 26, 15, 5, 24, 30, 15, 10, 15, 28,
  4, 4, 116, 28, 17, 0, 42, 26, 17, 6, 22, 28, 19, 6, 16, 30,
  2, 7, 111, 28, 17, 0, 46, 28, 7, 16, 24, 30, 34, 0, 13, 24,
  4, 5, 121, 30, 4, 14, 47, 28, 11, 14, 24, 30, 16, 14, 15, 30,
  6, 4, 117, 30, 6, 14, 45, 28, 11, 16, 24, 30, 30, 2, 16, 30,
  8, 4, 106, 26, 8, 13, 47, 28, 7, 22, 24, 30, 22, 13, 15, 30,
  10, 2, 114, 28, 19, 4, 46, 28, 28, 6, 22, 28, 33, 4, 16, 30,
  8, 4, 122, 30, 22, 3, 45, 28, 8, 26, 23, 30, 12, 28, 15, 30,
  3, 10, 117, 30, 3, 23, 45, 28, 4, 31, 24, 30, 11, 31, 15, 30,
  7, 7, 116, 30, 21, 7, 45, 28, 1, 37, 23, 30, 19, 26, 15, 30,
  5, 10, 115, 30, 19, 10, 47, 28, 15, 25, 24, 30, 23, 25, 15, 30,
  13, 3, 115, 30, 2, 29, 46, 28, 42, 1, 24, 30, 23, 28, 15, 30,
  17, 0, 115, 30, 10, 23, 46, 28, 10, 35, 24, 30, 19, 35, 15, 30,
  17, 1, 115, 30, 14, 21, 46, 28, 29, 19, 24, 30, 11, 46, 15, 30,
  13, 6, 115, 30, 14, 23, 46, 28, 44, 7, 24, 30, 59, 1, 16, 30,
  12, 7, 121, 30, 12, 26, 47, 28, 39, 14, 24, 30, 22, 41, 15, 30,
  6, 14, 121, 30, 6, 34, 47, 28, 46, 10, 24, 30, 2, 64, 15, 30,
  17, 4, 122, 30, 29, 14, 46, 28, 49, 10, 24, 30, 24, 46, 15, 30,
  4, 18, 122, 30, 13, 32, 46, 28, 48, 14, 24, 30, 42, 32, 15, 30,
  20, 4, 117, 30, 40, 7, 47, 28, 43, 22, 24, 30, 10, 67, 15, 30,
  19, 6, 118, 30, 18, 31, 47, 28, 34, 34, 24, 30, 20, 61, 15, 30
];

// Galois field log table
var glog = [
  0xff, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, 0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b,
  0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81, 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71,
  0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21, 0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45,
  0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9, 0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6,
  0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd, 0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88,
  0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd, 0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40,
  0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e, 0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d,
  0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b, 0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57,
  0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d, 0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18,
  0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c, 0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e,
  0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd, 0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61,
  0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e, 0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2,
  0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76, 0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6,
  0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa, 0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a,
  0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51, 0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7,
  0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8, 0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf
];

// Galios field exponent table
var gexp = [
  0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26,
  0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9, 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0,
  0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35, 0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23,
  0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, 0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1,
  0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc, 0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0,
  0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f, 0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2,
  0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88, 0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce,
  0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93, 0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc,
  0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9, 0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54,
  0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa, 0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73,
  0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e, 0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff,
  0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4, 0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41,
  0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e, 0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6,
  0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef, 0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09,
  0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5, 0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16,
  0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83, 0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x00
];

// Working buffers:
// data input and ecc append, image working buffer, fixed part of image, run lengths for badness
var strinbuf = [], eccbuf = [], qrframe = [], framask = [], rlens = [];
// Control values - width is based on version, last 4 are from table.
var version, width, neccblk1, neccblk2, datablkw, eccblkwid;
var ecclevel = 2;

// set bit to indicate cell in qrframe is immutable.  symmetric around diagonal
function setmask(x, y) {
  var bt;
  if (x > y) {
    bt = x;
    x = y;
    y = bt;
  }
  // y*y = 1+3+5...
  bt = y;
  bt *= y;
  bt += y;
  bt >>= 1;
  bt += x;
  framask[bt] = 1;
}

// enter alignment pattern - black to qrframe, white to mask (later black frame merged to mask)
function putalign(x, y) {
  var j;

  qrframe[x + width * y] = 1;
  for (j = -2; j < 2; j++) {
    qrframe[(x + j) + width * (y - 2)] = 1;
    qrframe[(x - 2) + width * (y + j + 1)] = 1;
    qrframe[(x + 2) + width * (y + j)] = 1;
    qrframe[(x + j + 1) + width * (y + 2)] = 1;
  }
  for (j = 0; j < 2; j++) {
    setmask(x - 1, y + j);
    setmask(x + 1, y - j);
    setmask(x - j, y - 1);
    setmask(x + j, y + 1);
  }
}

//========================================================================
// Reed Solomon error correction
// exponentiation mod N
function modnn(x) {
  while (x >= 255) {
    x -= 255;
    x = (x >> 8) + (x & 255);
  }
  return x;
}

var genpoly = [];

// Calculate and append ECC data to data block.  Block is in strinbuf, indexes to buffers given.
function appendrs(data, dlen, ecbuf, eclen) {
  var i, j, fb;

  for (i = 0; i < eclen; i++)
    strinbuf[ecbuf + i] = 0;
  for (i = 0; i < dlen; i++) {
    fb = glog[strinbuf[data + i] ^ strinbuf[ecbuf]];
    if (fb != 255)     /* fb term is non-zero */
      for (j = 1; j < eclen; j++)
        strinbuf[ecbuf + j - 1] = strinbuf[ecbuf + j] ^ gexp[modnn(fb + genpoly[eclen - j])];
    else
      for (j = ecbuf; j < ecbuf + eclen; j++)
        strinbuf[j] = strinbuf[j + 1];
    strinbuf[ecbuf + eclen - 1] = fb == 255 ? 0 : gexp[modnn(fb + genpoly[0])];
  }
}

//========================================================================
// Frame data insert following the path rules

// check mask - since symmetrical use half.
function ismasked(x, y) {
  var bt;
  if (x > y) {
    bt = x;
    x = y;
    y = bt;
  }
  bt = y;
  bt += y * y;
  bt >>= 1;
  bt += x;
  return framask[bt];
}

//========================================================================
//  Apply the selected mask out of the 8.
function applymask(m) {
  var x, y, r3x, r3y;

  switch (m) {
    case 0:
      for (y = 0; y < width; y++)
        for (x = 0; x < width; x++)
          if (!((x + y) & 1) && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
      break;
    case 1:
      for (y = 0; y < width; y++)
        for (x = 0; x < width; x++)
          if (!(y & 1) && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
      break;
    case 2:
      for (y = 0; y < width; y++)
        for (r3x = 0, x = 0; x < width; x++ , r3x++) {
          if (r3x == 3)
            r3x = 0;
          if (!r3x && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      break;
    case 3:
      for (r3y = 0, y = 0; y < width; y++ , r3y++) {
        if (r3y == 3)
          r3y = 0;
        for (r3x = r3y, x = 0; x < width; x++ , r3x++) {
          if (r3x == 3)
            r3x = 0;
          if (!r3x && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      }
      break;
    case 4:
      for (y = 0; y < width; y++)
        for (r3x = 0, r3y = ((y >> 1) & 1), x = 0; x < width; x++ , r3x++) {
          if (r3x == 3) {
            r3x = 0;
            r3y = !r3y;
          }
          if (!r3y && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      break;
    case 5:
      for (r3y = 0, y = 0; y < width; y++ , r3y++) {
        if (r3y == 3)
          r3y = 0;
        for (r3x = 0, x = 0; x < width; x++ , r3x++) {
          if (r3x == 3)
            r3x = 0;
          if (!((x & y & 1) + !(!r3x | !r3y)) && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      }
      break;
    case 6:
      for (r3y = 0, y = 0; y < width; y++ , r3y++) {
        if (r3y == 3)
          r3y = 0;
        for (r3x = 0, x = 0; x < width; x++ , r3x++) {
          if (r3x == 3)
            r3x = 0;
          if (!(((x & y & 1) + (r3x && (r3x == r3y))) & 1) && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      }
      break;
    case 7:
      for (r3y = 0, y = 0; y < width; y++ , r3y++) {
        if (r3y == 3)
          r3y = 0;
        for (r3x = 0, x = 0; x < width; x++ , r3x++) {
          if (r3x == 3)
            r3x = 0;
          if (!(((r3x && (r3x == r3y)) + ((x + y) & 1)) & 1) && !ismasked(x, y))
            qrframe[x + y * width] ^= 1;
        }
      }
      break;
  }
  return;
}

// Badness coefficients.
var N1 = 3, N2 = 3, N3 = 40, N4 = 10;

// Using the table of the length of each run, calculate the amount of bad image
// - long runs or those that look like finders; called twice, once each for X and Y
function badruns(length) {
  var i;
  var runsbad = 0;
  for (i = 0; i <= length; i++)
    if (rlens[i] >= 5)
      runsbad += N1 + rlens[i] - 5;
  // BwBBBwB as in finder
  for (i = 3; i < length - 1; i += 2)
    if (rlens[i - 2] == rlens[i + 2]
      && rlens[i + 2] == rlens[i - 1]
      && rlens[i - 1] == rlens[i + 1]
      && rlens[i - 1] * 3 == rlens[i]
      // white around the black pattern? Not part of spec
      && (rlens[i - 3] == 0 // beginning
        || i + 3 > length  // end
        || rlens[i - 3] * 3 >= rlens[i] * 4 || rlens[i + 3] * 3 >= rlens[i] * 4)
    )
      runsbad += N3;
  return runsbad;
}

// Calculate how bad the masked image is - blocks, imbalance, runs, or finders.
function badcheck() {
  var x, y, h, b, b1;
  var thisbad = 0;
  var bw = 0;

  // blocks of same color.
  for (y = 0; y < width - 1; y++)
    for (x = 0; x < width - 1; x++)
      if ((qrframe[x + width * y] && qrframe[(x + 1) + width * y]
        && qrframe[x + width * (y + 1)] && qrframe[(x + 1) + width * (y + 1)]) // all black
        || !(qrframe[x + width * y] || qrframe[(x + 1) + width * y]
          || qrframe[x + width * (y + 1)] || qrframe[(x + 1) + width * (y + 1)])) // all white
        thisbad += N2;

  // X runs
  for (y = 0; y < width; y++) {
    rlens[0] = 0;
    for (h = b = x = 0; x < width; x++) {
      if ((b1 = qrframe[x + width * y]) == b)
        rlens[h]++;
      else
        rlens[++h] = 1;
      b = b1;
      bw += b ? 1 : -1;
    }
    thisbad += badruns(h);
  }

  // black/white imbalance
  if (bw < 0)
    bw = -bw;

  var big = bw;
  var count = 0;
  big += big << 2;
  big <<= 1;
  while (big > width * width)
    big -= width * width, count++;
  thisbad += count * N4;

  // Y runs
  for (x = 0; x < width; x++) {
    rlens[0] = 0;
    for (h = b = y = 0; y < width; y++) {
      if ((b1 = qrframe[x + width * y]) == b)
        rlens[h]++;
      else
        rlens[++h] = 1;
      b = b1;
    }
    thisbad += badruns(h);
  }
  return thisbad;
}

function genframe(instring) {
  var x, y, k, t, v, i, j, m;

  // find the smallest version that fits the string
  t = instring.length;
  version = 0;
  do {
    version++;
    k = (ecclevel - 1) * 4 + (version - 1) * 16;
    neccblk1 = eccblocks[k++];
    neccblk2 = eccblocks[k++];
    datablkw = eccblocks[k++];
    eccblkwid = eccblocks[k];
    k = datablkw * (neccblk1 + neccblk2) + neccblk2 - 3 + (version <= 9);
    if (t <= k)
      break;
  } while (version < 40);

  // FIXME - insure that it fits insted of being truncated
  width = 17 + 4 * version;

  // allocate, clear and setup data structures
  v = datablkw + (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
  for (t = 0; t < v; t++)
    eccbuf[t] = 0;
  strinbuf = instring.slice(0);

  for (t = 0; t < width * width; t++)
    qrframe[t] = 0;

  for (t = 0; t < (width * (width + 1) + 1) / 2; t++)
    framask[t] = 0;

  // insert finders - black to frame, white to mask
  for (t = 0; t < 3; t++) {
    k = 0;
    y = 0;
    if (t == 1)
      k = (width - 7);
    if (t == 2)
      y = (width - 7);
    qrframe[(y + 3) + width * (k + 3)] = 1;
    for (x = 0; x < 6; x++) {
      qrframe[(y + x) + width * k] = 1;
      qrframe[y + width * (k + x + 1)] = 1;
      qrframe[(y + 6) + width * (k + x)] = 1;
      qrframe[(y + x + 1) + width * (k + 6)] = 1;
    }
    for (x = 1; x < 5; x++) {
      setmask(y + x, k + 1);
      setmask(y + 1, k + x + 1);
      setmask(y + 5, k + x);
      setmask(y + x + 1, k + 5);
    }
    for (x = 2; x < 4; x++) {
      qrframe[(y + x) + width * (k + 2)] = 1;
      qrframe[(y + 2) + width * (k + x + 1)] = 1;
      qrframe[(y + 4) + width * (k + x)] = 1;
      qrframe[(y + x + 1) + width * (k + 4)] = 1;
    }
  }

  // alignment blocks
  if (version > 1) {
    t = adelta[version];
    y = width - 7;
    for (; ;) {
      x = width - 7;
      while (x > t - 3) {
        putalign(x, y);
        if (x < t)
          break;
        x -= t;
      }
      if (y <= t + 9)
        break;
      y -= t;
      putalign(6, y);
      putalign(y, 6);
    }
  }

  // single black
  qrframe[8 + width * (width - 8)] = 1;

  // timing gap - mask only
  for (y = 0; y < 7; y++) {
    setmask(7, y);
    setmask(width - 8, y);
    setmask(7, y + width - 7);
  }
  for (x = 0; x < 8; x++) {
    setmask(x, 7);
    setmask(x + width - 8, 7);
    setmask(x, width - 8);
  }

  // reserve mask-format area
  for (x = 0; x < 9; x++)
    setmask(x, 8);
  for (x = 0; x < 8; x++) {
    setmask(x + width - 8, 8);
    setmask(8, x);
  }
  for (y = 0; y < 7; y++)
    setmask(8, y + width - 7);

  // timing row/col
  for (x = 0; x < width - 14; x++)
    if (x & 1) {
      setmask(8 + x, 6);
      setmask(6, 8 + x);
    } else {
      qrframe[(8 + x) + width * 6] = 1;
      qrframe[6 + width * (8 + x)] = 1;
    }

  // version block
  if (version > 6) {
    t = vpat[version - 7];
    k = 17;
    for (x = 0; x < 6; x++)
      for (y = 0; y < 3; y++ , k--)
        if (1 & (k > 11 ? version >> (k - 12) : t >> k)) {
          qrframe[(5 - x) + width * (2 - y + width - 11)] = 1;
          qrframe[(2 - y + width - 11) + width * (5 - x)] = 1;
        } else {
          setmask(5 - x, 2 - y + width - 11);
          setmask(2 - y + width - 11, 5 - x);
        }
  }

  // sync mask bits - only set above for white spaces, so add in black bits
  for (y = 0; y < width; y++)
    for (x = 0; x <= y; x++)
      if (qrframe[x + width * y])
        setmask(x, y);

  // convert string to bitstream
  // 8 bit data to QR-coded 8 bit data (numeric or alphanum, or kanji not supported)
  v = strinbuf.length;

  // string to array
  for (i = 0; i < v; i++)
    eccbuf[i] = strinbuf.charCodeAt(i);
  strinbuf = eccbuf.slice(0);

  // calculate max string length
  x = datablkw * (neccblk1 + neccblk2) + neccblk2;
  if (v >= x - 2) {
    v = x - 2;
    if (version > 9)
      v--;
  }

  // shift and repack to insert length prefix
  i = v;
  if (version > 9) {
    strinbuf[i + 2] = 0;
    strinbuf[i + 3] = 0;
    while (i--) {
      t = strinbuf[i];
      strinbuf[i + 3] |= 255 & (t << 4);
      strinbuf[i + 2] = t >> 4;
    }
    strinbuf[2] |= 255 & (v << 4);
    strinbuf[1] = v >> 4;
    strinbuf[0] = 0x40 | (v >> 12);
  } else {
    strinbuf[i + 1] = 0;
    strinbuf[i + 2] = 0;
    while (i--) {
      t = strinbuf[i];
      strinbuf[i + 2] |= 255 & (t << 4);
      strinbuf[i + 1] = t >> 4;
    }
    strinbuf[1] |= 255 & (v << 4);
    strinbuf[0] = 0x40 | (v >> 4);
  }
  // fill to end with pad pattern
  i = v + 3 - (version < 10);
  while (i < x) {
    strinbuf[i++] = 0xec;
    // buffer has room    if (i == x)      break;
    strinbuf[i++] = 0x11;
  }

  // calculate and append ECC

  // calculate generator polynomial
  genpoly[0] = 1;
  for (i = 0; i < eccblkwid; i++) {
    genpoly[i + 1] = 1;
    for (j = i; j > 0; j--)
      genpoly[j] = genpoly[j]
        ? genpoly[j - 1] ^ gexp[modnn(glog[genpoly[j]] + i)] : genpoly[j - 1];
    genpoly[0] = gexp[modnn(glog[genpoly[0]] + i)];
  }
  for (i = 0; i <= eccblkwid; i++)
    genpoly[i] = glog[genpoly[i]]; // use logs for genpoly[] to save calc step

  // append ecc to data buffer
  k = x;
  y = 0;
  for (i = 0; i < neccblk1; i++) {
    appendrs(y, datablkw, k, eccblkwid);
    y += datablkw;
    k += eccblkwid;
  }
  for (i = 0; i < neccblk2; i++) {
    appendrs(y, datablkw + 1, k, eccblkwid);
    y += datablkw + 1;
    k += eccblkwid;
  }
  // interleave blocks
  y = 0;
  for (i = 0; i < datablkw; i++) {
    for (j = 0; j < neccblk1; j++)
      eccbuf[y++] = strinbuf[i + j * datablkw];
    for (j = 0; j < neccblk2; j++)
      eccbuf[y++] = strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))];
  }
  for (j = 0; j < neccblk2; j++)
    eccbuf[y++] = strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))];
  for (i = 0; i < eccblkwid; i++)
    for (j = 0; j < neccblk1 + neccblk2; j++)
      eccbuf[y++] = strinbuf[x + i + j * eccblkwid];
  strinbuf = eccbuf;

  // pack bits into frame avoiding masked area.
  x = y = width - 1;
  k = v = 1;         // up, minus
  /* inteleaved data and ecc codes */
  m = (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
  for (i = 0; i < m; i++) {
    t = strinbuf[i];
    for (j = 0; j < 8; j++ , t <<= 1) {
      if (0x80 & t)
        qrframe[x + width * y] = 1;
      do {        // find next fill position
        if (v)
          x--;
        else {
          x++;
          if (k) {
            if (y != 0)
              y--;
            else {
              x -= 2;
              k = !k;
              if (x == 6) {
                x--;
                y = 9;
              }
            }
          } else {
            if (y != width - 1)
              y++;
            else {
              x -= 2;
              k = !k;
              if (x == 6) {
                x--;
                y -= 8;
              }
            }
          }
        }
        v = !v;
      } while (ismasked(x, y));
    }
  }

  // save pre-mask copy of frame
  strinbuf = qrframe.slice(0);
  t = 0;           // best
  y = 30000;         // demerit
  // for instead of while since in original arduino code
  // if an early mask was "good enough" it wouldn't try for a better one
  // since they get more complex and take longer.
  for (k = 0; k < 8; k++) {
    applymask(k);      // returns black-white imbalance
    x = badcheck();
    if (x < y) { // current mask better than previous best?
      y = x;
      t = k;
    }
    if (t == 7)
      break;       // don't increment i to a void redoing mask
    qrframe = strinbuf.slice(0); // reset for next pass
  }
  if (t != k)         // redo best mask - none good enough, last wasn't t
    applymask(t);

  // add in final mask/ecclevel bytes
  y = fmtword[t + ((ecclevel - 1) << 3)];
  // low byte
  for (k = 0; k < 8; k++ , y >>= 1)
    if (y & 1) {
      qrframe[(width - 1 - k) + width * 8] = 1;
      if (k < 6)
        qrframe[8 + width * k] = 1;
      else
        qrframe[8 + width * (k + 1)] = 1;
    }
  // high byte
  for (k = 0; k < 7; k++ , y >>= 1)
    if (y & 1) {
      qrframe[8 + width * (width - 7 + k)] = 1;
      if (k)
        qrframe[(6 - k) + width * 8] = 1;
      else
        qrframe[7 + width * 8] = 1;
    }
  return qrframe;
}


var _canvas = null;
const QR = {

  get ecclevel() {
    return ecclevel;
  },

  set ecclevel(val) {
    ecclevel = val;
  },

  get size() {
    return _size;
  },

  set size(val) {
    _size = val
  },

  get canvas() {
    return _canvas;
  },

  set canvas(el) {
    _canvas = el;
  },

  getFrame: function (string) {
    return genframe(string);
  },
  //这里的utf16to8(str)是对Text中的字符串进行转码，让其支持中文
  utf16to8: function (str) {
    var out, i, len, c;

    out = "";
    len = str.length;
    for (i = 0; i < len; i++) {
      c = str.charCodeAt(i);
      if ((c >= 0x0001) && (c <= 0x007F)) {
        out += str.charAt(i);
      } else if (c > 0x07FF) {
        out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
        out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
        out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
      } else {
        out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
        out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
      }
    }
    return out;
  },
  /**
   * 新增$this参数，传入组件的this,兼容在组件中生成
   * @param bg 目前只能设置颜色值
   */
  draw: function (str, ctx, startX, startY, cavW, cavH, bg, color, $this, ecc) {
    var that = this;
    ecclevel = ecc || ecclevel;
    if (!ctx) {
      console.warn('No canvas provided to draw QR code in!')
      return;
    }
    var size = Math.min(cavW, cavH);
    str = that.utf16to8(str);//增加中文显示

    var frame = that.getFrame(str);
    var px = size / width;
    if (bg) {
      ctx.fillStyle = bg
      ctx.fillRect(startX, startY, cavW, cavW);
    }
    ctx.fillStyle = color || 'black'
    for (var i = 0; i < width; i++) {
      for (var j = 0; j < width; j++) {
        if (frame[j * width + i]) {
          ctx.fillRect(startX + px * i, startY + px * j, px, px);
        }
      }
    }
  }
}

export default QR;
// module.exports = { api }


